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TC811

更新时间: 2024-09-25 22:20:03
品牌 Logo 应用领域
美国微芯 - MICROCHIP 转换器
页数 文件大小 规格书
14页 122K
描述
3-1/2 Digit Analog-To-Digital Converter with Hold and Differential Reference Inputs

TC811 数据手册

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TC811  
3-1/2 Digit Analog-To-Digital Converter with Hold and  
Differential Reference Inputs  
FEATURES  
TYPICAL APPLICATIONS  
Differential Reference Input  
Display Hold Function  
Thermometry  
Digital Meters  
Fast Over-Range Recovery, Guaranteed Next  
Reading Accuracy  
— Voltage/Current/Power  
— pH Measurement  
— Capacitance/Inductance  
— Fluid Flow Rate/Viscosity  
— Humidity  
Low Temperature Drift Internal  
Reference ....................................... 35ppm/°C (Typ)  
Guaranteed Zero Reading With Zero Input  
Low Noise..................................................... 15µVp-p  
High Resolution (0.05%) and Wide Dynamic  
Range (72 dB)  
High Impedance Differential Input  
Low Input Leakage Current .................... 1pA (Typ)  
10pA Max  
Direct LCD Drive -No External Components  
Precision Null Detection with True Polarity at Zero  
Crystal Clock Oscillator  
Available in DIP, Compact Flat Package or PLCC  
Convenient 9V Battery Operation with  
Low Power Dissipation (600µA Typical, 1mW  
Maximum)  
— Position  
Panel Meters  
LVDT Indicators  
Portable Instrumentation  
Digital Scales  
Process Monitors  
Gaussometers  
Photometers  
ORDERING INFORMATION  
Temp.  
Range  
Max VREF  
Temp. Co.  
Part No.  
Package  
TC811CKW 44-Pin PQFP  
0°C to +70°C 75 ppm/°C  
TC811CPL  
40-Pin Plastic DIP 0°C to +70°C 75 ppm/°C  
FUNCTIONAL BLOCK DIAGRAM  
TYPICAL SEGMENT OUTPUT  
+
V
0.5mA  
2mA  
SEGMENT  
OUTPUT  
LCD DISPLAY  
INTERNAL DIGITAL GROUND  
BACKPLANE  
21  
TC811CPL  
C
C
AZ  
INT  
R
C
INT  
V
REF  
+
+
LCD SEGMENT DRIVERS  
7 SEGMENT  
+
C
V
V
V
INT  
C
V
BUFF  
REF  
REF  
REF  
REF  
29  
35  
36  
33  
34  
28  
38  
27  
INTEGRATOR  
7 SEGMENT  
DECODE  
7 SEGMENT  
DECODE  
200  
DECODE  
TO  
DIGITAL  
SECTION  
+
+
ZI &  
A/Z  
+
ZI & A/Z  
10  
µA  
DATA LATCH  
TENS  
A/Z  
ZI  
31  
+
IN  
COMPARATOR  
V
UNITS  
THOUSANDS  
HUNDREDS  
DE  
(–)  
DE  
(+)  
INT  
A/Z  
LOW  
TO SWITCH DRIVERS  
TEMPCO  
V
FROM COMPARATOR OUTPUT  
REF  
38  
+
+
V
DE (+)  
DE (–)  
32  
30  
ANALOG  
COMMON  
CLOCK  
+
V
– 3.0V  
f
70kΩ  
OSC  
6.2V  
500  
4
CONTROL LOGIC  
AZ & DE (±)  
V
IN  
TEST  
26  
INT  
INTERNAL DIGITAL GOUND  
V
TH  
= 1V  
V
26  
V
40  
OSC  
39  
1
OSC  
1
2
22MΩ  
HLDR  
470k  
10pF  
20pF  
+
+
V
V
© 2001 Microchip Technology Inc. DS21472A  
TC811-7 11/5/96  

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